Django自定义--中间件

自定义中间件

• process_request(self, request)

• process_response(self, request, response)

• process_view(self, request, view_func, view_args, view_kwargs)

• process_exception(self, request, exception)

• 返回None,继续处理,返回HttpResponse,就结束

• 中间件配置:来时从上往下,走势从下往上

MIDDLEWARE_CLASSES = (
            'middleware',
            ......
        )

• 老版中间件

class CommonMiddleware(object):
        def process_request(self, request):
            return None

        def process_response(self, request, response):
            return response

• 新版中间件

class SimpleMiddleware(object):
        def __init__(self, get_response):
            self.get_response = get_response

        def __call__(self, request):
            # 调用 view 之前的代码

            response = self.get_response(request)

            # 调用 view 之后的代码

            return response

• 兼容版

try:
    from django.utils.deprecation import MiddlewareMixin  # Django 1.10.x
except ImportError:
    MiddlewareMixin = object  # Django 1.4.x - Django 1.9.x
 
class SimpleMiddleware(MiddlewareMixin):
    def process_request(self, request):
        pass
    def process_response(request, response):
        pass